True or False, Scrum allows additional events that are not defined in Scrum.

The Nexus Guide says: "Nexus adds to or extends the events defined by Scrum", and points out that "Scaled Scrum is still Scrum".

How do I answer my question in a PSM 1 certification exam? True or False

If this is for the exam then an hint is when you see certain keywords such as "allows", "manages", "enforce", "permits" then the answer is false.

In reality Scrum does not enforce anything, it's a guide, the team and org must figure out how to us it to improve their delivery of what the user needs regularly.
Ideally the team should use the scrum events, if additional recurring conversations are required then include them in the scrum events. Ad hoc conversations are inevitable in software development. As a scrum master keep an eye out for recurring ones, talk to the people involved and pull them into the correct scrum event.

How would you answer this question based on this sentence in the Scrum Guide?

Events are used in Scrum to create regularity and to minimize the need for meetings not defined in Scrum.

The question is: "True or False, Scrum allows additional events that are not defined in Scrum."

The question must be answered true or false.

Where in the Scrum Guide does it say you cannot build process on top of Scrum? As the Scrum Guide says: "Scrum is simple. Try it as is and determine if its philosophy, theory, and structure help to achieve goals and create value. The Scrum framework is purposefully incomplete, only defining the parts required to implement Scrum theory. Scrum is built upon by the collective intelligence of the people using it. Rather than provide people with detailed instructions, the rules of Scrum guide their relationships and interactions.

Various processes, techniques and methods can be employed within the framework. Scrum wraps around existing practices or renders them unnecessary. Scrum makes visible the relative efficacy of current management, environment, and work techniques, so that improvements can be made."

Shure it does. You have have events all day long if this adds value

Considering that you are in an exam, you must answer true or false to the question "Scrum allows additional events that are not defined in Scrum".